In my day, I can't recall Mojo's being for sale. Black Jacks and Fruit Salads were 4 for a penny. Then they went up to 2 a penny and Bazooka Joes were a whole penny.

I lived by a railway line as a kid so I used to go 'stretch' pennies and use them on the tuppence machines outside the shops. If you stuck them in at the right angle, you could fool it into giving up it's more expensive chews/sweets/gum. Other cheats were push outs from electrical pattresses. Same size as a shilling/5p coin. The stuff you get for 5 pence. Happy times.....